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Synthetic aroma chemicals

Cyclopentanone

Also known as Adipic ketone, Ketocyclopentane, Ketopentamethylene

CAS 120-92-3Formula C5H8OMolar mass 84.12 g/molEC 204-435-9
GHS signal word: Warning. Pictograms: Flammable, Harmful or irritant 73 suppliers listed
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Cyclopentanone chemical structure, C5H8O, CAS 120-92-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Water-white, mobile liquid
Melting point
-51.3 °C
Boiling point
130.6 °C
Density
Relative density (water = 1): 0.95
Flash point
30.6 °C
HS code
291429
Category
Synthetic aroma chemicals
UN number
UN 2245
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Cyclopentanone?

Plain description, key identifiers and synonyms

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent. It has a role as a Maillard reaction product.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cyclopentanone
CAS number
120-92-3 CAS number cross-checked
EC number
204-435-9
Molecular formula
C5H8O
UNII
220W81TN3S
MDL number
MFCD00001409
INCI name
CYCLOPENTANONE
InChIKey
BGTOWKSIORTVQH-UHFFFAOYSA-N
InChI
InChI=1S/C5H8O/c6-5-3-1-2-4-5/h1-4H2
SMILES (canonical and isomeric)
C1CCC(=O)C1

Synonyms

  • Adipic ketone
  • Ketocyclopentane
  • Ketopentamethylene
  • Dumasin
  • Adipinketon
  • Adipin keton
  • cyclopentan-1-one
  • oxocyclopentane
  • cyclopentanon
  • Cyclopentanone (2,2,5,5-d4)
  • cyclopentaneon
  • Dumasine
  • cyclo-pentanone
  • 2-cyclopentanone
  • Cyclopentanone [UN2245] [Flammable liquid]
  • Cyclopentanone, >=99%, FG
  • Cyclopentanone, analytical standard
  • UN 2245
  • Cyclopentanone, ReagentPlus(R), >=99%
  • 3-Acetyl-6-methyl-Pyran-2,4(3H)-dione
  • Cyclopentanone, ReagentPlus(R), >=99.0%
  • Cyclopentanone Solution in Acetonitrile, 1000ug/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Water-white, mobile liquidexp.
Odour
DISTINCTIVE ETHEREAL ODOR, SOMEWHAT LIKE PEPPERMINTexp.
Melting point
-51.3 °Cexp.
Boiling point
130.6 °Cexp.
Density
Relative density (water = 1): 0.95exp.
Flash point
30.6 °Cexp.
Solubility
Estimated water solubility of 9175 mg/lexp.
Vapour pressure
11.4 mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
84.12 g/molcalc.
Exact mass
84.0575 Dacalc.
LogP (octanol/water)
1.13calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.8calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1CCCC1

O=C1CCCC1

1 ring, 6 atoms. This chemical is the scaffold itself.

1,367 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
320NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
Precautionary statements (19)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2245
Transport hazard class
3
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Cyclopentanone suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 73 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

73 suppliers in 11 countries

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Cyclopentanone price

Indicative price range per kg from live supplier offers

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Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Intermediate for pharmaceuticals, biologicals, insecticides, & rubber chemicals.

Industrial uses: Solvent, Intermediate.

Consumer uses: Fragrance.

Cosmetic ingredient, INCI name CYCLOPENTANONE(perfuming)

Roles

  • Maillard reaction product
  • thermal degradation product

Functional uses

  • Flavouring and nutrient
  • Fragrance

Cosmetic functions

  • Perfuming

How it is made

Prepd by heating adipic acid to 285-295 °c in presence of barium hydroxide, distilling, extracting with ether & fractionating.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 606-025-00-9

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cyclopentanone is traded under.

HS 2914.29Indicative HS code

Cyclanic, cyclenic or cycloterpenic ketones without other oxygen function, other

World exports in 2024
$1B
+6.6% vs 2023, imports $980M
2019 to 2024
Top exporters
  1. China32.5%
  2. India * partner reported12.9%
  3. Germany12.3%
Top importers
  1. United States15.7%
  2. Japan8.7%
  3. Germany8.7%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Cyclopentanone is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cyclopentanone, based on the data on this page

What is Cyclopentanone?

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent. It has a role as a Maillard reaction product.

What is the CAS number of Cyclopentanone?

The CAS registry number of Cyclopentanone is 120-92-3.

What is the molecular formula and weight of Cyclopentanone?

The molecular formula of Cyclopentanone is C5H8O and its molar mass is 84.12 g/mol.

What is Cyclopentanone used for?

Intermediate for pharmaceuticals, biologicals, insecticides, & rubber chemicals. Industrial uses: Solvent, Intermediate. Consumer uses: Fragrance.

Is Cyclopentanone hazardous?

Cyclopentanone carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Cyclopentanone?

Cyclopentanone is usually classified under HS code 291429 (Cyclanic, cyclenic or cycloterpenic ketones without other oxygen function, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cyclopentanone?

CompoundList lists 73 suppliers of Cyclopentanone in China, United States, India, Germany and 7 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Cyclopentanone in India?

7 suppliers in India list Cyclopentanone on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Cyclopentanone?

Suppliers quote Cyclopentanone on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Cyclopentanone

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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